Abstract
THE faint high latitude X-ray sources are a mixed population of galactic and extragalactic objects. Identified extragalactic X-ray sources include clusters of galaxies, Seyfert and other active galaxies, quasars, and nearby normal galaxies1,2. Identified galactic sources with ∣bII∣ > 20° include several X-ray binaries, two in globular clusters—M15 (ref. 1) and NGC1851 (ref. 3)—the hot white dwarf HZ43 (ref. 4), the dwarf binary AM Her (ref. 5) and the flare star UV Ceti (ref. 6). The high-latitude sources generally lie in fields of low obscuration and density of objects so that the prospects for their identification with optical or other counterparts are relatively good, given position measurements of moderate accuracy. We report here a precise celestial location (1′ error radius) for one such X-ray source, 3U0042+32 (ref. 1), that is situated at mid-galactic latitude (bII ∼ −30°). A study of the error box for this source indicates that it may be a distant galactic binary system similar to Her X-1.
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RAPPAPORT, S., CLARK, G., DOWER, R. et al. Variable mid-latitude X-ray source 3U0042+32. Nature 268, 705–706 (1977). https://doi.org/10.1038/268705a0
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DOI: https://doi.org/10.1038/268705a0
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